ALT — BARO ALTITUDE HOLD MODE
Description The ALT hold mode generates collective commands to maintain a selected aircraft barometric
altitude.
Engagement • Direct: ....................................................... Press ALT button on Guidance Controller
• Automatic:.......... ALT mode automatically engages when ALTA mode has acquired
the pre-selected altitude
References
and performance
ALT mode maintains the barometric altitude existing at the time of engagement.
When engaged the baro altitude hold reference is displayed as a small magenta bug on the
Barometric Altimeter on PFDs.
The altitude hold reference bug is adjusted by either:
• setting either pilot or copilot collective Beep Trim CLTV/YAW switches to UP (to increase
altitude) or DN (to reduce altitude) (Beep rate: ±50 ft/s)
• pressing the collective FTR switch while flying to the desired barometric altitude, and
then releasing the FTR.
Changing the ALT reference causes a Reference Change aural tone to be played when the
reference begins to change. While the reference is being changed and for 5 seconds after
finishing, no Reference Change aural tone is played.
Adjustment of the barometric setting value displayed on the selected PFD will induce a corresponding
change of the indicated altitude.
When changing the barometric setting value with the ALT mode engaged, the mode will command
a climb or descent as necessary to return to the barometric altitude corresponding to
the respective value indicated at the time ALT mode was engaged, last synchronized or beeped.
ALT mode can be engaged with HOV mode as an alternative to the RHT mode.